Contact lens flat icons8/19/2023 ![]() Figure 2: Beam profile in a distance of 2 mm behind an axicon, illuminated with a Gaussian laser beam.Ī precision-polished axicon can also be used for generating an approximation of a Bessel beam – a kind of non-diffracting beam – from an ordinary input laser beam, typically a Gaussian beam. Applications of Axiconsįor some applications, one requires a ring-shaped pattern as obtained in a sufficiently large distance after an axicon illuminated with parallel light. Such fiber axicon lenses can be used for coupling light into very small waveguides of photonic integrated circuits, for example. There are also fiber axicon lenses, where near a fiber end the fiber diameter is rapidly reduced down essentially to zero. They can be made from various optical materials mostly, one uses common optical glasses such as fused silica. Just as other lenses, axicons are available in uncoated forms, but are often delivered with anti-reflection coatings for certain spectral regions. In the form of custom optics, a wider range of parameters is possible. with 90° but also with much larger angles such as 160°. Axicons with a wide range of apex angles are available as stock optics, e.g. One often specifies the apex angle of an axicon this is 180° minus twice the above-mentioned axicon angle. Alternatively, axicons are called conical prisms. ![]() Figure 1: Ray tracing simulation for an axicon with parallel incident light.Īxicons may be considered as specialty lenses ( conical lenses) after all, their outer shape and the typical way of mounting is similar as for lenses. For monochromatic light, for example, one of course obtains interference effects, creating a ring structure, in the region where the different contributions of reflected light overlap. Refraction thus leads to a constant ray deflection angle within a range of input ray positions.įigure 1 shows a ray tracing simulation for an axicon with parallel incident light. The inclination angle of the surface (called the axicon angle) does not change with increasing distance from the optical axis, while it would continuously change for an ordinary lens. In most cases, the transverse cross-section is a circle, as for an ordinary lens. Generally, one side is conical, with the tip looking outwards, and the other surface is flat ( plano-convex axicon). How to cite the article suggest additional literatureĪn axicon (also called axicon lens) is an optical device similar to a lens, where however one has a conical rather than curved surface. Definition: lenses with a conical surface
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